\pgfkeys{/tikz/.cd,
	start coordinate/.initial

		=%
		{%
			0,\vertfactor%
		}%
	,
	start coordinate/.initial%
		=%
		{%
			0,\vertfactor%
		}%
	,
	start coordinate/.initial%
		=%
		{%
			0,\vertfactor%
		}%
	,
	start coordinate/.initial%
		=%
		{%
			0,\vertfactor%
		}%
	,
}
